i am thinking of heating my greenhouse(30x96) with RMH .have never built one or used one. checked out all the info. and vids on the net but didn't see any thing on what max. length of exhaust tube can be.sincethe exhaust can be ran horizontally is the exhaust considered to have draw or isit forced out by the burn chamber?also does anyone know kind of BTU say an eight unit would put out? how big of a unit can you build?
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